netdev - Re: [PATCH 1/2] af_unix: fix unix_dgram_poll() behavior for EPOLLOUT event

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Date:	Mon, 08 Nov 2010 13:44:38 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	alban.crequy@...labora.co.uk, netdev@...r.kernel.org,
	davidel@...ilserver.org
Subject: Re: [PATCH 1/2] af_unix: fix unix_dgram_poll() behavior for
 EPOLLOUT event

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sun, 31 Oct 2010 16:36:23 +0100

> [PATCH 1/2] af_unix: fix unix_dgram_poll() behavior for EPOLLOUT event
> 
> Alban Crequy reported a problem with connected dgram af_unix sockets and
> provided a test program. epoll() would miss to send an EPOLLOUT event
> when a thread unqueues a packet from the other peer, making its receive
> queue not full.
> 
> This is because unix_dgram_poll() fails to call sock_poll_wait(file,
> &unix_sk(other)->peer_wait, wait);
> if the socket is not writeable at the time epoll_ctl(ADD) is called. 
> 
> We must call sock_poll_wait(), regardless of 'writable' status, so that
> epoll can be notified later of states changes.
> 
> Misc: avoids testing twice (sk->sk_shutdown & RCV_SHUTDOWN)
> 
> Reported-by: Alban Crequy <alban.crequy@...labora.co.uk>
> Cc: Davide Libenzi <davidel@...ilserver.org>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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